package lang.reflect.Proxy;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

/**
 * @author 黄军艳
 * @version 1.0
 * @date 2024/11/29  9:08
 */
public class LoggingInvocationHandler implements InvocationHandler {
    private final Object target;

    public LoggingInvocationHandler(Object target) {
        this.target = target;
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        //获实现类中的方法信息
        Method methodTarget = target.getClass().getMethod(method.getName());
        //判断方法上面是否有Log注解
        if (methodTarget.isAnnotationPresent(Log.class)){
            String methodName = method.getName();
            DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
            LocalDateTime startTime = LocalDateTime.now();
            System.out.println("[LOG] Method："+methodName+" started at: "+startTime.format(formatter));
            Object result = method.invoke(target, args);
            LocalDateTime endTime = LocalDateTime.now();
            long duration=java.time.Duration.between(startTime,endTime).toMillis();
            System.out.println("[LOG] Method："+methodName+" ended at: "+endTime.format(formatter));
            System.out.println("[LOG] Method："+methodName+" executed in: "+duration+"ms");
            return result;
        }else {
            return method.invoke(target, args);
        }
    }
}
